X, formerly Twitter, has said it has removed or flagged "tens of thousands of pieces of content" since Hamas attacked Israel.
Chief executive Linda Yaccarino said it had removed hundreds of accounts. The EU had given X a 24-hour deadline to explain how it was complying with European law.
It acted after it said there had been a surge in misinformation on social media about the conflict, such as doctored images and mislabelled videos.
The EU previously said it had "indications" that X being used to "disseminate illegal content and disinformation" in Europe. Facebook and Instagram-owner Meta has also been handed a similar warning about disinformation - and 24 hour deadline - by the EU.
The EU introduced new laws in August 2023 which regulate the kind of content that is allowed online.
